* {
  margin: 0;
  padding: 0;
}
#app {
  width: 500px;
  min-height: 100px;
  margin: 50px auto;
  border: 1px solid black;
  box-sizing: border-box;
  padding: 0 10px;
}
#app #app-top {
  display: flex;
  height: 50px;
  line-height: 50px;
  justify-content: space-between;
  font-size: 16px;
}
#app #app-top #app-top-left {
  color: blue;
}
#app #app-top #app-top-right {
  color: tomato;
}
#app #app-mid textarea {
  width: 100%;
  font-size: 14px;
  text-indent: 16px;
  line-height: 16px;
}
#app #app-bottom {
  display: flex;
  height: 50px;
  line-height: 50px;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}
#app #app-bottom #app-bottom-left {
  display: flex;
}
#app #app-bottom #app-bottom-left section.bottom-left-item {
  width: 65px;
}
#app #app-bottom #app-bottom-right .title {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 70px;
  height: 30px;
  border-radius: 4px;
  background-color: tomato;
  color: white;
}
